首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Mass Strandings of Whales 1. The tide goes out suddenly,【T1】______ the whales【T1】______ 2. Mass strandings linked to paras
Mass Strandings of Whales 1. The tide goes out suddenly,【T1】______ the whales【T1】______ 2. Mass strandings linked to paras
admin
2019-04-29
41
问题
Mass Strandings of Whales
1. The tide goes out suddenly,【T1】______ the whales【T1】______
2. Mass strandings linked to parasites
a. Evidence: Stranded animals infested with many parasites
b. Example: Worms found in the ears of dead whales
Whales rely heavily on their hearing to【T2】______【T2】______
This type of infestation can be very harmful
3. Mass strandings related to toxins or poisons
Toxins【T3】______ from plants or animals【T3】______
The whale ingests these toxins
Whether leading to stranding or not depends upon the toxin【T4】______【T4】______
4. Mass strandings caused by following their prey ashore
Example【T5】______whales beached after following the squid ashore【T5】______
Not true for most mass strandings
The animals’ stomach【T6】______ reveal most had not been feeding【T6】______
5. Mass strandings linked to humans
A growing concern: loud【T7】______ made by humans cause strandings【T7】______
Noises caused by【T8】______ are of particular concern【T8】______
6. Mass strandings related to group【T9】______【T9】______
Whales follow【T10】______ leaders ashore【T10】______
【T3】
Mass Strandings of Whales
Good afternoon everyone. Well, with some of you will go out on fieldwork it’s timely that in this afternoon’s session I’ll be sharing some ideas about the reasons why groups of whales and dolphins sometimes swim ashore from the sea right onto the beach and, most often, die in what were known as "mass stranding". Unfortunately, this type of event is a frequent occurrence in some of the locations that you’ll be travelling to, where sometimes the tide goes out suddenly, confusing the animals.
However, there are many other theories about the causes of mass strandings. The first is that the behavior is linked to parasites. It’s often found that stranded animals were infested with large numbers of parasites. For instance, a type of worm is commonly found in the ears of dead whales. Since marine animals rely heavily on their hearing to navigate, this type of infestation has the potential to be very harmful. Another theory is related to toxins, or poisons. These have also been found to contribute to the death of many marine animals. Many toxins, as I’m sure you’re aware, originate from plants, or animals. The whale ingests these toxins in its normal feeding behavior but whether these poisons directly or indirectly lead to stranding and death, seems to depend upon the toxin involved. Alternatively, it has also been suggested that some animals stranded accidentally by following their prey ashore in the confusion of the chase. Last year, David Thurston monitored pilot whales that beached after following the squid ashore. However, this idea does not seem to hold true for the majority of mass strandings because examination of the animals’ stomach contents reveal that most had not been feeding as they stranded. There were also some new theories, which link strandings to humans. A growing concern is that loud noises in the ocean cause strandings. Noises such as these caused by military exercises are of particular concern and have been pinpointed as the cause of some strandings of late.
A final theory is related to group behaviour, and suggests that sea mammals cannot distinguish between sick and healthy leaders and will follow sick leaders, even to an inevitable death. This is a particularly interesting theory since the whales that are thought to be most social—the toothed whales—are the group that strand the most frequently. The theory is also supported by evidence from a dolphin stranding in 1994. Examination of the dead animals revealed that apart from the leader, all the others had been healthy at the time of their death.
Without one consistent theory however it is very hard for us to do anything about this phenomenon except to assist animals where and when we can. Stranding networks have been established around the world to aid in rescuing animals and collecting samples from those that could not be helped. I recommend John Connor’s Marine Mammals Ashore as an excellent starting point if you’re interested in finding out more about these networks, or establishing one yourself.
选项
答案
originate
解析
本题涉及毒素与动植物的关系。空格所在处缺少动词,故空格处需填入动词或动词短语。录音提到,毒素来自于动植物,故空格处填入originate。
转载请注明原文地址:https://kaotiyun.com/show/KnRK777K
0
专业英语四级
相关试题推荐
Despitewhatyoumightthinkfromitsname,theMuseumofAfghanCivilizationwillbetheverymodelofamodemmajormuseumwhe
Itmaybeoneoftheworld’sgreatshoppingdestinations,butLondon’sRegentStreetisfailingthefashiontest,accordingtot
"Untilrecently,Ithoughtthattherewouldneveragainbeanopportunitytobeinvolvedwithanindustryassociallydestructiv
ConservationistsonTuesdayappealedtocountriestourgentlyaddressnewthreatstowhales,dolphinsandothercetaceans(鲸类动物)a
MassStrandingsofWhales1.Thetidegoesoutsuddenly,【T1】______thewhales【T1】______2.Massstrandingslinkedtoparasitesa
Wemetalarge_______ofwhalesonourvoyagetoAustralia.
SummerSchoolandOnlineClassesIntheUnitedStates,【T1】______forhighschoolstudents【T2】______.But【T3】______.【T4】______
WhalesSufferingfromShippingScientistsareworkingtoreducethenoiselevels/experiencedbywhalesfromNorthAtlantic
CultureShock1.Whatiscultureshock?Disorientationexperiencedwhensuddenlysubjectedto【T1】______2.Common【T2】______ofc
随机试题
再生障碍性贫血的主要临床表现急性白血病主要临床表现
决定细胞外液渗透压的主要因素是()
赵运,男,云南省农民,于1996年对家里人声称外出打工,至今毫无消息。期间没有同家里联系过,也没人见过他或与他有过联系。赵运自小父母双亡,由哥哥赵东抚养长大。于1990年与邻村女青年苗丽结婚,婚后有了两个孩子:赵强、赵壮,现在分别为10岁、9岁。根据上述案
某城市规划中心为了重新规划本市的居民区,制订了一整套规划方案。由于居住区的规划是一项综合性较强的工作,故需要考虑的因素很多,如使用要求、卫生标准、安全程度等,该城市规划中心对住宅建筑及居住区道路绿地等公共设施的规划布置进行全面系统地统计,为居民创造一个生活
某外贸公司以假报出口方式骗取国家出口退税款3000元,税务机关发现该情况后,不正确的做法是()。
城镇土地使用税以纳税人实际占用的土地面积为计税依据。()
甲将原值28万元的房产评估作价30万元投资乙企业,乙企业办理产权登记后又将该房产以40万元价格售与丙企业,当地契税税率3%,则()。
统一管理单位的全部档案、归口负责全部档案工作的机构是()档案工作机构。
视频带宽是显示器视频放大器通频带宽度的简称。带宽越宽,响应速度越快,允许通过的信号频率越高,信号失真越小。假设显示器的分辨率是1280×1024,帧频为90fps,它的视频带宽大约是多少?______
Isupportyourdecision,butIshouldalsomakeitclearthatIamnotgoingtobe________toit
最新回复
(
0
)